Robtex

Up: 131.253.20.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 131.253.21.0/25
Down right: 131.253.21.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
131.253.21.1	A+PTR	ns3.msedge.net
131.253.21.1	A	ns3.a-msedge.net
131.253.21.1	A	ns1.m1-msedge.net
131.253.21.2	A+PTR	ns4.msedge.net
131.253.21.2	A	ns2.m1-msedge.net
131.253.21.2	A	ns2.afdentry.net
131.253.21.197	PTR	www.msedge.net
131.253.21.200	PTR	origin.any.bing.com
131.253.21.200	PTR	any.edge.bing.com